diff --git a/src/main/java/org/codelibs/fess/app/web/admin/backup/AdminBackupAction.java b/src/main/java/org/codelibs/fess/app/web/admin/backup/AdminBackupAction.java
index 11d393867..cac38e368 100644
--- a/src/main/java/org/codelibs/fess/app/web/admin/backup/AdminBackupAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/admin/backup/AdminBackupAction.java
@@ -41,7 +41,6 @@ import org.apache.commons.text.StringEscapeUtils;
 import org.codelibs.core.exception.IORuntimeException;
 import org.codelibs.core.io.CopyUtil;
 import org.codelibs.core.misc.Pair;
-import org.codelibs.elasticsearch.runner.net.Curl;
 import org.codelibs.elasticsearch.runner.net.CurlResponse;
 import org.codelibs.fess.Constants;
 import org.codelibs.fess.app.web.base.FessAdminAction;
@@ -52,7 +51,6 @@ import org.codelibs.fess.es.log.exbhv.UserInfoBhv;
 import org.codelibs.fess.mylasta.direction.FessConfig;
 import org.codelibs.fess.util.ComponentUtil;
 import org.codelibs.fess.util.RenderDataUtil;
-import org.codelibs.fess.util.ResourceUtil;
 import org.lastaflute.core.magic.async.AsyncManager;
 import org.lastaflute.web.Execute;
 import org.lastaflute.web.response.ActionResponse;
diff --git a/src/main/java/org/codelibs/fess/app/web/admin/esreq/AdminEsreqAction.java b/src/main/java/org/codelibs/fess/app/web/admin/esreq/AdminEsreqAction.java
index c8032dcd8..fa91ca77f 100644
--- a/src/main/java/org/codelibs/fess/app/web/admin/esreq/AdminEsreqAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/admin/esreq/AdminEsreqAction.java
@@ -25,14 +25,12 @@ import java.util.Locale;
 import org.codelibs.core.io.CopyUtil;
 import org.codelibs.core.io.ReaderUtil;
 import org.codelibs.core.lang.StringUtil;
-import org.codelibs.elasticsearch.runner.net.Curl;
 import org.codelibs.elasticsearch.runner.net.CurlRequest;
 import org.codelibs.elasticsearch.runner.net.CurlResponse;
 import org.codelibs.fess.Constants;
 import org.codelibs.fess.app.web.base.FessAdminAction;
 import org.codelibs.fess.helper.CurlHelper;
 import org.codelibs.fess.util.ComponentUtil;
-import org.codelibs.fess.util.ResourceUtil;
 import org.lastaflute.web.Execute;
 import org.lastaflute.web.response.ActionResponse;
 import org.lastaflute.web.response.HtmlResponse;
diff --git a/src/main/java/org/codelibs/fess/app/web/api/admin/backup/ApiAdminBackupAction.java b/src/main/java/org/codelibs/fess/app/web/api/admin/backup/ApiAdminBackupAction.java
index d022f979a..15e42d0c2 100644
--- a/src/main/java/org/codelibs/fess/app/web/api/admin/backup/ApiAdminBackupAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/api/admin/backup/ApiAdminBackupAction.java
@@ -33,7 +33,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.function.Consumer;
 
-import org.codelibs.elasticsearch.runner.net.Curl;
 import org.codelibs.elasticsearch.runner.net.CurlResponse;
 import org.codelibs.fess.Constants;
 import org.codelibs.fess.app.web.api.ApiResult;
@@ -41,7 +40,6 @@ import org.codelibs.fess.app.web.api.ApiResult.ApiBackupFilesResponse;
 import org.codelibs.fess.app.web.api.admin.FessApiAdminAction;
 import org.codelibs.fess.mylasta.direction.FessConfig;
 import org.codelibs.fess.util.ComponentUtil;
-import org.codelibs.fess.util.ResourceUtil;
 import org.lastaflute.web.Execute;
 import org.lastaflute.web.response.JsonResponse;
 import org.lastaflute.web.response.StreamResponse;
diff --git a/src/main/java/org/codelibs/fess/dict/DictionaryManager.java b/src/main/java/org/codelibs/fess/dict/DictionaryManager.java
index 707252a84..b84218fcb 100644
--- a/src/main/java/org/codelibs/fess/dict/DictionaryManager.java
+++ b/src/main/java/org/codelibs/fess/dict/DictionaryManager.java
@@ -27,11 +27,9 @@ import java.util.Map;
 import javax.annotation.PostConstruct;
 
 import org.codelibs.core.io.FileUtil;
-import org.codelibs.elasticsearch.runner.net.Curl;
 import org.codelibs.elasticsearch.runner.net.CurlResponse;
 import org.codelibs.fess.Constants;
 import org.codelibs.fess.util.ComponentUtil;
-import org.codelibs.fess.util.ResourceUtil;
 import org.dbflute.optional.OptionalEntity;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
diff --git a/src/main/java/org/codelibs/fess/es/client/FessEsClient.java b/src/main/java/org/codelibs/fess/es/client/FessEsClient.java
index 621ee8deb..d4a3f4a47 100644
--- a/src/main/java/org/codelibs/fess/es/client/FessEsClient.java
+++ b/src/main/java/org/codelibs/fess/es/client/FessEsClient.java
@@ -45,7 +45,6 @@ import org.codelibs.core.io.ResourceUtil;
 import org.codelibs.core.lang.StringUtil;
 import org.codelibs.elasticsearch.runner.ElasticsearchClusterRunner;
 import org.codelibs.elasticsearch.runner.ElasticsearchClusterRunner.Configs;
-import org.codelibs.elasticsearch.runner.net.Curl;
 import org.codelibs.elasticsearch.runner.net.CurlResponse;
 import org.codelibs.fess.Constants;
 import org.codelibs.fess.entity.FacetInfo;
diff --git a/src/main/java/org/codelibs/fess/util/UpgradeUtil.java b/src/main/java/org/codelibs/fess/util/UpgradeUtil.java
index 2ed60f97b..90d88f6a3 100644
--- a/src/main/java/org/codelibs/fess/util/UpgradeUtil.java
+++ b/src/main/java/org/codelibs/fess/util/UpgradeUtil.java
@@ -20,7 +20,6 @@ import java.util.function.Consumer;
 
 import org.codelibs.core.exception.ResourceNotFoundRuntimeException;
 import org.codelibs.core.io.FileUtil;
-import org.codelibs.elasticsearch.runner.net.Curl;
 import org.codelibs.elasticsearch.runner.net.CurlResponse;
 import org.codelibs.fess.mylasta.direction.FessConfig;
 import org.elasticsearch.action.ActionListener;